a question: Does Big Star rise to the level of Christian Rock?
I tend to think no, mostly for two reasons: (1.) It's not ALL they wrote about, and (2.) the message is subordinate to the music.
Having said that, there was a weird little hippie religious thing as the sixties segued into the seventies: Jesus Christ Superstar, Godspell, Spirit in the Sky. I've written about that before: I do find it interesting.
So, do we think Alex Chilton = Amy Grant?